Thanks for getting in touch!
I bought the dual node package and its shipping, turns out the package weights quite a lot and shipping agent including taxes will cost me additional $200
So I had to buy the cheaper 2x 2640s
Will get them in a week or two
To use graphics card you had to get a secondary PSU (for PCIe cable), right?
Hm, do you know if its PCIe slot provides the 175w power as desktop motherboard do (for cards like amd rx480 which has no power connector)
Hm, what's your primary application by the way?